conduit-extra-1.1.9.2: Batteries included conduit: adapters for common libraries.

Safe Haskell | Trustworthy
Language | Haskell98

Data.Conduit.Lazy

Description

Use lazy I/O for consuming the contents of a source. Warning: All normal warnings of lazy I/O apply. In particular, if you are using this with a `ResourceT` transformer, you must force the list to be evaluated before exiting the `ResourceT`.

Synopsis

- lazyConsume :: (MonadBaseControl IO m, MonadActive m) => Source m a -> m [a]
- class Monad m => MonadActive m where
  - monadActive :: m Bool

# Documentation

lazyConsume :: (MonadBaseControl IO m, MonadActive m) => Source m a -> m [a] Source

Use lazy I/O to consume all elements from a `Source`.

This function relies on `monadActive` to determine if the underlying monadic state has been closed.

Since 0.3.0

class Monad m => MonadActive m where Source

Determine if some monad is still active. This is intended to prevent usage of a monadic state after it has been closed. This is necessary for such cases as lazy I/O, where an unevaluated thunk may still refer to a closed `ResourceT`.

Since 0.3.0

Methods

monadActive :: m Bool Source

Instances

MonadActive IO Source |
MonadActive Identity Source |
MonadActive (ST s) Source |
MonadActive (ST s) Source |
MonadActive m => MonadActive (MaybeT m) Source |
(MonadIO m, MonadActive m) => MonadActive (ResourceT m) Source |
MonadActive m => MonadActive (ListT m) Source |
MonadActive m => MonadActive (IdentityT m) Source |
(Monoid w, MonadActive m) => MonadActive (WriterT w m) Source |
(Monoid w, MonadActive m) => MonadActive (WriterT w m) Source |
MonadActive m => MonadActive (StateT s m) Source |
MonadActive m => MonadActive (StateT s m) Source |
MonadActive m => MonadActive (ReaderT r m) Source |
(Error e, MonadActive m) => MonadActive (ErrorT e m) Source |
MonadActive m => MonadActive (ConduitM i o m) Source |
(Monoid w, MonadActive m) => MonadActive (RWST r w s m) Source |
(Monoid w, MonadActive m) => MonadActive (RWST r w s m) Source |
MonadActive m => MonadActive (Pipe l i o u m) Source |